Backrest assembly with front and rear frames

ABSTRACT

A backrest assembly includes a front frame having annular outer and inner peripheries. An annular lip is formed on a rear surface of the front frame and extends along the annular inner periphery of the front frame. A net is mounted to a front surface of the front frame. The front frame is received in an annular groove defined between annular inner and outer walls formed on a front face of a rear frame, with the annular inner and outer peripheries and the annular lip of the front frame located between the annular inner and outer walls of the rear frame, with the front surface of the front frame covering a front opening of the annular groove of the rear frame, with a fastener extending through each of a plurality of engaging holes of the front frame into one of the plurality of engaging holes of the rear frame.

BACKGROUND OF THE INVENTION

The present invention relates to a backrest assembly with front and rear frames and, more particularly, to a backrest assembly including front and rear frames that can be rapidly assembled to provide enhanced efficiency while providing reliability and an aesthetic appearance.

Among various backrests, a backrest of a type includes a net for ventilation and sitting comfort. In an example shown in U.S. Pat. No. 8,029,066, the backrest includes a front frame having a rear surface on which inner and outer annular flanges are formed, defining a first annular groove therebetween. Pegs are formed in the first annular groove.

The backrest further includes a rear frame having inner and outer annular walls on a front face thereof, with a second annular groove defined between the inner and outer annular walls. Stubs are formed in the second annular groove, with each stub having a receptacle. A net is mounted to the front frame. Each peg of the front frame is inserted into the receptacle of one of the stubs of the rear frame. A fastener is extended through each of a plurality of engaging holes of the front frame into one of a plurality of engaging holes of the rear frame, providing reliable assemblage. The fasteners can not be seen from the rear face of the rear frame to provide an aesthetic appearance.

However, assemblage of the stubs and the pegs is time-consuming

Thus, a need exists for a novel backrest assembly that can be rapidly assembled while providing reliability and an aesthetic appearance.

BRIEF SUMMARY OF THE INVENTION

An objective of the present invention is to provide a backrest assembly including front and rear frames that can be rapidly assembled while providing reliable assemblage.

A backrest assembly according to the present invention includes a front frame made of rigid material. The front frame is annular and includes a front surface and a rear surface opposite to the front surface. The front frame further includes an annular outer periphery extending between the front and rear surfaces. The front frame further includes an annular inner periphery extending between the front and rear surfaces and surrounded by the annular outer periphery. An annular lip is formed on the rear surface and extends along the annular inner periphery of the front frame. The annular lip includes a plurality of engaging holes. A net made of flexible material is mounted to the front surface of the front frame. A rear frame is made of rigid material and includes a front face and a rear face opposite to the front face. An annular outer wall and an annular inner wall are formed on the front face of the rear frame. An annular groove is defined between the annular outer wall and the annular inner wall. The annular groove receives the front frame and includes a front opening facing away from the rear face. The annular inner wall includes a plurality of engaging holes. The front frame is inserted into the annular groove of the rear frame via the front opening, with the annular inner and outer peripheries and the annular lip of the front frame located between the annular inner and outer walls of the rear frame, with the front surface of the front frame covering the front opening of the annular groove of the rear frame, with the plurality of engaging holes of the front frame aligned with the plurality of engaging holes of the rear frame, with a fastener extending through each of the plurality of engaging holes of the front frame into one of the plurality of engaging holes of the rear frame, preventing the front frame from disengaging from the rear frame.

An annular outer edge of the net can be folded back to cover an annular edge portion of the rear surface of the front frame. A plurality of nails is extended through the annular outer edge portion of the net into the rear surface of the front frame. The net is sandwiched between the annular outer periphery of the front frame and an annular inner face of the annular outer wall of the rear frame.

The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.

DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an exploded, perspective view of a backrest assembly according to the present invention.

FIG. 2 shows a perspective view of a net and a front frame of the backrest assembly of FIG. 1.

FIG. 3 shows a perspective view of the backrest assembly of FIG. 1 after assemblage.

FIG. 4 shows a cross sectional view taken along section line A-A in FIG. 3.

FIG. 5 shows a cross sectional view taken along section line B-B in FIG. 3.

FIG. 6 shows a cross sectional view taken along section line C-C in FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1-6, a backrest assembly according to the present invention includes a front frame 1, a net 2, a rear frame 3, and a plurality of fasteners 4. The front frame 1 is made of rigid material and is annular. The front frame 1 includes a front surface 11 and a rear surface 12 opposite to the front surface 11. The front frame 1 further includes an annular outer periphery 121 extending between the front and rear surfaces 11 and 12. The front frame 11 further includes an annular inner periphery 122 extending between the front and rear surfaces 11 and 12 and surrounded by the annular outer periphery 121. An annular lip 13 is formed on the rear surface 12 and extends along the annular inner periphery 122 of the front frame 11. The annular lip 13 includes a plurality of engaging holes 14, with each engaging hole 14 extending along an axis parallel to and spaced from the front surface 11.

The net 2 is made of flexible material. The net 2 is mounted to the front surface 11 of the front frame 1. An annular outer edge of the net 2 is folded back to cover an annular edge portion of the rear surface 12 of the front frame 1. Nails 22 are extended through the annular outer edge portion of the net 2 into the rear surface 12 of the front frame 1. The net 2 is in a tightened state after assemblage.

The rear frame 3 is made of rigid material and includes a front face and a rear face 30 opposite to the front face. An annular outer wall 32 and an annular inner wall 33 are formed on the front face of the rear frame 3, with an annular groove 31 defined between the annular outer wall 32 and the annular inner wall 33. The annular groove 31 includes a front opening 34 facing away from the rear face 30. The annular inner wall 33 includes a plurality of engaging holes 35. With reference to FIGS. 5 and 6, each of the annular outer and inner walls 32 and 33 of the rear frame 3 is high enough to cover the annular outer and inner peripheries 121 and 122 of the front frame 1.

The fasteners 4 extend through the engaging holes 14 of the front frame 1 and the engaging holes 35 of the rear frame 3 to enhance assembling reliability.

With reference to FIGS. 3-6, after fixing the net 2 to the front frame 1, the front frame 1 is inserted into the annular groove 31 of the rear frame 3 via the front opening 34, with the annular inner and outer peripheries 122 and 121 and the annular lip 13 of the front frame 1 located between the annular inner and outer walls 33 and 32 of the rear frame 3, with the front surface 11 of the front frame 1 covering the front opening 34 of the annular groove 31 of the rear frame 3, with the engaging holes 14 of the front frame 1 aligned with the engaging holes 35 of the rear frame 3, with the net 2 sandwiched between the annular outer periphery 121 of the front frame 1 and an annular inner face of the annular outer wall 32 of the rear frame 3. Each fastener 4 extends through one of the engaging holes 14 of the front frame 1 into one of the engaging holes 35 of the rear frame 3, preventing the front frame 1 from disengaging from the rear frame 3 to achieve assembling reliability. Thus, the front and rear frames 1 and 3 can be rapidly assembled with each other. The fasteners 4 are fixed in the annular inner wall 33 of the rear frame 3, not exposed outside of the annular inner wall 33, providing an aesthetic appearance for the backrest, as shown in FIGS. 5 and 6.

The assembling speed and efficiency of the front and rear frames 1 and 3 of the backrest according to the present invention can be enhanced to provide reliability and an aesthetic appearance.

Although specific embodiments have been illustrated and described, numerous modifications and variations are still possible without departing from the essence of the invention. The scope of the invention is limited by the accompanying claims. 

1. A backrest assembly comprising: a front frame made of rigid material, with the front frame being annular and including a front surface and a rear surface opposite to the front surface, with the front frame further including an annular outer periphery extending between the front and rear surfaces, with the front frame further including an annular inner periphery extending between the front and rear surfaces and surrounded by the annular outer periphery, with an annular lip formed on the rear surface and extending along the annular inner periphery of the front frame, with the annular lip including a plurality of engaging holes; a net made of flexible material, with the net mounted to the front surface of the front frame; a rear frame made of rigid material, with the rear frame including a front face and a rear face opposite to the front face, with an annular outer wall and an annular inner wall formed on the front face of the rear frame, with an annular groove defined between the annular outer wall and the annular inner wall, with the annular groove receiving the front frame and including a front opening facing away from the rear face, with the annular inner wall including a plurality of engaging holes; and a plurality of fasteners, with the front frame inserted into the annular groove of the rear frame via the front opening, with the annular inner and outer peripheries and the annular lip of the front frame located between the annular inner and outer walls of the rear frame, with the front surface of the front frame covering the front opening of the annular groove of the rear frame, with the plurality of engaging holes of the front frame aligned with the plurality of engaging holes of the rear frame, with each of the plurality of fasteners extending through one of the plurality of engaging holes of the front frame into one of the plurality of engaging holes of the rear frame, preventing the front frame from disengaging from the rear frame.
 2. The backrest assembly as claimed in claim 1, with an annular outer edge of the net folded back to cover an annular edge portion of the rear surface of the front frame, with a plurality of nails extended through the annular outer edge portion of the net into the rear surface of the front frame, with the net sandwiched between the annular outer periphery of the front frame and an annular inner face of the annular outer wall of the rear frame. 